Improving the Performance at Elevated Temperature of High Voltage Graphite/LiNi0.5Mn1.5O4 Cells with Added Lithium Catechol Dimethyl Borate

Performance of LiNi0.5Mn1.5O4/graphite cells cycled to 4.8 V at 55°C with the 1.2 M LiPF6 in EC/EMC (3/7, STD electrolyte) with and without added lithium catechol dimethyl borate (LiCDMB) has been investigated. The incorporation of 0.5 wt% LiCDMB to the STD electrolyte results in an improved capacit...

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Bibliographic Details
Published in:Journal of the Electrochemical Society 2017-01, Vol.164 (2), p.A128-A136
Main Authors: Dong, Yingnan, Demeaux, Julien, Zhang, Yuzi, Xu, Mengqing, Zhou, Liu, MacIntosh, Alex D., Lucht, Brett L.
Format: Article
Language:English
Subjects:
Electrolyte
ENERGY STORAGE
High Voltage
Lithium Ion Battery
surface film
Online Access:Get full text
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Summary:Performance of LiNi0.5Mn1.5O4/graphite cells cycled to 4.8 V at 55°C with the 1.2 M LiPF6 in EC/EMC (3/7, STD electrolyte) with and without added lithium catechol dimethyl borate (LiCDMB) has been investigated. The incorporation of 0.5 wt% LiCDMB to the STD electrolyte results in an improved capacity retention and coulombic efficiency upon cycling at 55°C. Ex-situ analysis of the electrode surfaces via a combination of SEM, TEM, and XPS reveals that oxidation of LiCDMB at high potential results in the deposition of a passivation layer on the electrode surface, preventing transition metal ion dissolution from the cathode and subsequent deposition on the anode. NMR investigations of the bulk electrolyte stored at 85°C reveals that added LiCDMB prevents the thermal decomposition of LiPF6.
ISSN:0013-4651
1945-7111
DOI:10.1149/2.0331702jes